public void setPubKey(byte[] y, byte[] p, byte[] q, byte[] g) throws Exception {
DSAPublicKeySpec dsaPubKeySpec =
new DSAPublicKeySpec(
new BigInteger(y), new BigInteger(p), new BigInteger(q), new BigInteger(g));
PublicKey pubKey = keyFactory.generatePublic(dsaPubKeySpec);
signature.initVerify(pubKey);
}
public void setPubKey(byte[] e, byte[] n) throws Exception {
RSAPublicKeySpec rsaPubKeySpec = new RSAPublicKeySpec(new BigInteger(n), new BigInteger(e));
PublicKey pubKey = keyFactory.generatePublic(rsaPubKeySpec);
signature.initVerify(pubKey);
}